You should be careful not to register a company under a name which infringes a registered trade mark. If your company name infringes a registered trade mark you could be sued by the owner of that trade mark.
You should definitely not use a company name which misleads the public into believing that your business is that of another business.
Registration of a company name with Companies House only prevents others from registering a company under the same name: it does not legally protect your company name, nor does it protect you against trade mark infringement.
It is often advisable to conduct a trademark search before registering your company, and to register your company name as a trade mark. If Companies House is informed that your company name infringes a registered trade mark, they will direct you to change your company name, and additional fees will apply.
E-mail us at firstname.lastname@example.org, if you need further help with trademark issues. Additional fees apply for a trade mark consultation, and a trade mark search.